Hydraulic motor.



PATENTED APR. 21, 1908;,

J. G. McDOWELL. HYDRAULIC MOTOR. APPLIOATIOK FILED AUG. 18, 1906.RENEWED SEPT. 6, 1907;

2 SfiBETS-SHEET 1.

QW NH WITNESSES THE- NORRIS PETERS c0, wAsmucroIv, n c.

PATENTED. APR. 21, 1908.

J. G. McDOWELL.

I HYDRAULIC MOTOR. APPLICATION FILED AUG. 18,1906, RENEWED SEPT. 6.1907.

2 SHEETS-SHEET Zf THE NORRIS PETERS co wnsmmrrmv. o. c.

' that by using a leaf spring I can JOHN G. MCDOWELL, OR'PITTSBURG,PENNSYLVANIA".

Specification of Letters-Patent.

Patented April 2 1 1908'.

Application filed-August 18,1906, Serial-No; 331,197.Renewedisegtemberi6,.1907. SerialNo. 391,701.

To all whom it may; concerna'.

Be: it. known. thatll, JOHN; G. MoDowEnL, of. Pittsburg, Alleghenycounty, Pennsylva 111a, haveinventeda new andiusefulrl mprove ment in.Hydraulic Motors;v of. which: the; fol-- lowing is: a. full, clear, andexactdesoriptiom. reference being: had? to the accompanyin drawings,forming of? this=speoification in which- Figure 1. is an.irreg-.ularhorizontalr section on the line II of Fig. 2; Fig. 2 is. a; transversesectionon. the line IIII of Fig. 1; Fig; 3 is a face viewof'tlie piston,and Fig. 4 is a central cross-section of thes'ame:

My invention relates to;thaticlassiofiwater motors wherein springsareemployediin connection with the shifting valves; and the object ofthe invention is to cheapen and improve the springs and lengthen theirlife. Heretofore in such matters an individual spring has been providedfor each valve, and these springs have been made of wire. In the use ofthese springs it has been found that their life is short, the springeither breaking or losing its resilience. I have discovered reatlylengthen the life of the springs; and% have further found that by usingone spring which acts upon two valves, I can reduce the number ofsprings and improve the action and life of the motor.

In the drawings I show my invention as applied to a motor of the typeset forth in the application of Oscar F. Grant and myself, Serial No.281,898, filed October 9th, 1905. In these figures, the numeral 2designates the cylinder of the motor, which is secured between the twoflanged heads 3, secured by the through-bolts 4, at the top and bottomof the cylinder.

5 is the water inlet port communicating with the water inlet passage 6,and provided with a suitable coupling 7 for connection with the hose orother water supply pipe. The ends of the inlet passage 6 communicatewith the respective ends of-the cylinder through the heads 3. The inletport 5 is controlled by a valve 8 secured to a longitudinally extendingvalve rod 8, whose end portions extend into the chambers of the heads 3.Said rod is provided with guides 9, which maintain it centrally withinthe passage 6.

10 is the outlet or escape, which opens outwardly from thelongitudinally extending outlet passage 11, which also communicates withthe cylinder at each end, through the outlet: ports. 12. and 153'respectively. These 1 ports. 12; and i 1 31 are? respectivelycontrolled.

bythezvalves. 14, on: opposite end portions of the: valve rod; 1 which:extends through the passage lrlL and hasthe centralizing-guides 16Pivotally mounted: within. each of the heads 3- are. two. levers 1.7,.117.; Each lever 17 has onerarm extendingintoposition. to be engaged. bythe ends of" the valve rod: 8, while its. other; arm: pro 'ects slightlywithinthe:endportioniofithe cy ind'er 2 in. a position to 'beiengagediby the piston'rl9z. Each of thelev'e'rss 1.27 has one off itsarms extended? into positionito-be engaged by avalve 1.4L andi its othenarm. extendeda within the end portion of thee cylinder. in the: samemanner as the corresponding arms of the lever 17.

Instead of the springs, which, in the said application are shown asapplied to the levers 17 I provide two springs 20, which are preferablyof annular shape and are secured to the opposite faces of the piston 19.I have shown these s rings as secured by throughrivets 21 whic arecommon to both springs. Each spring preferably consists of a brassannulus, which is bent or inclined outwardly as shown in Fig. 4. Thesprings may be cut from sheet brass and then bent up in any desirablemanner. The projecting portion of each spring is so arranged that itwill contact at or near the end of the stroke with the levers 17 or 17*,thus compressing the spring.

22 represents the piston rod working through the stuffing box 23, and towhich the machine to be driven'by the motor may be connected in anysuitable manner.

The operation of the motor is as follows Supposing the piston 19 to bemovingin the direction of the arrow, water enters the cylintion of theoutlet assage 11, as indicated by the arrow. As t e piston approachesthe end of its stroke, the spring contacts with the arms of the levers17 and 17 compressing the springs and actuating the levers. When thelast mentioned contact takes lace, said levers are moved to actuate theva ve rods 8 and 15, so that the valve 8 is shifted to the opposite sideof the port 5, the port 12 is c osed by one of the valves 14, and theother valve 14 is moved to open the port 13, thus roviding for theadmission of water to the eft-hand end of the cylinder and escape fromthe right-hand end. Owing to the degree of valves, &c., Withoutdeparting from my incompression given the springs 20 before the levers17, 17 are operated by the piston, there is imparted to the valve rods aquick operating movement of such character as to make certain that thevalves 5 and 14 will be positively and fully shifted. Without thesesprings, owing to the pressure of Water against the valves to resisttheir shifting movement, the valves would remain in central relation totheir respective ports, Which would, of course, prevent the operation ofthe motor. This is entirely prevented by the springs 20, as theirimpulse is sufficient to throw the valves past their centers.

The advantages of my invention result from the use of a leaf spring,Which I have found to retain its resilience for a long time, thus givinglong life to the motor Without repair. It also results from the use of asingle spring which operates a plurality of valves, thereby reducing thenumber of springs and enabling a stronger spring to be used.

Many variations may be made in the form and arrangement of the cylinder,piston, the

vention.

I claim 1. In a hydraulic motor, a cylinder, a reciprocating piston,valves mounted in a stationary part of the motor, levers arranged toactuate the valves, and leaf springs secured to opposite sides of thepiston and arranged to contact With the levers near the end of thestroke; substantially as described.

2. In a hydraulic motor, a cylinder, a reciprocating piston, a pair ofcurved leaf springs secured to the opposite faces of the piston, inletand outlet valves, and levers arranged to actuate said valves, saidlevers contacting With the piston sprin s near the end of its stroke;substantially as described.

In testimony whereof I have hereunto set my hand.

JOHN G. MoDOWELL.

Witnesses:

JOHN MILLER, H. M. CoRwIN.

